Shaking-screen.



No. 670,087. PatentedMar. 19, I901.

N. STEDMAN.

SHARING suntan.

(Application filed Apr. 7, 1900; (No Model.)

flzz/wlujzdmm ji 7 F FICEG NATHAN STEDMAN, OF'AURORA, INDIANA.

SHAKlNG-SCREEN.

SPECIFICATION forming part of Letters Patent N 0. 670,087, dated March19, 1901.

Serial No. 12,015. (No model.)

To :r/M whom it may concern.-

Be it known that I, NATHAN STEDMAN, (whose post-office address isAurora, Indiana) a citizen of the United States, residing at Aurora, inthe county of Dear-born and State of Indiana, have invented certain newand useful Improvements in Shaking-Screens; and I do declare thefollowing to be a full, clear, and exact description of theinvention,such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to improvements in the class of screens havingmeans for their vibration and also means in the nature of reciprocatinghammers for imparting blows to said screens to prevent clogging.

The object of the invention is the general improveinentof the screenwhereby increased efficiency and durability are obtained and theprovision of a novel and effective impact device which is capable ofadjustment to regulate the force of the blow and which is actuatedthrough movement of the screen.

The nature of the improvements will be readily comprehended,referencebeing had to the following detailed description and to the accompanyingdrawings, in which- Figure 1 is a side elevation, partly broken away, ofa vibrating screen embodying myinvention. Fig. 2 is a plan View, partlybroken away. Fig. 3 is an end elevation, partly broken away. Fig. 4 is adetail view, enlarged, of the impact device and the means for actuatingit.

Referring to the drawings by letter, A denotes the frame, and B is thescreen, which is supported in the upper portion of the frame, preferablyby hanger-rods c c, said rods being pivoted to the screen-frame b and tostandards dd, bolted to the upper frame-beams a a. A transverse shaft Eis mounted in bearingboxes 6 e on the beams Cb, and centrally of theshaft is a crank e, which is connected by a pitmau fwith one end of thescreen. On the shaft is a fly-wheel E, which is provided with acounterbalanoe-weight E adjustably mounted on a spoke e whereby saidweight is movable to meet the resistance from the screen vibrations.Properly adjusted this weight enablesthe operation of the screen at ahigh speed, with the minimum of jar or side motion to the frame A. Apulley e on the shaft has belt connection with a suitable source ofpower.

G denotes a shaft which extends transversely across the screen-framebelow the screen about midway of the length of the latter. The shaft ismounted in bearingboXes h, bolted to the under side of the framebeams'a. Centrally of the shaft is fixed a lever, the arms I I of which extendlongitudinally of the screen, and said arms terminate in upturned headst' i, which alternaltely strike against the under side of the screen andproduce the jar necessary to prevent the screen meshes or orifices fromclogging. The vibrating movement of the screen is employed to actuatethe lever to produce the blows. This is efiected by the following means:Secured to the outer side of one of the side bars of the screen, bymeans of apertured lugs a a, is a rod j, the ends of which are threadedand project beyond the lugs for the reception of nuts jj. The rodj isthreaded at each side of its center to receive adj usting-nutsfij andjamnuts 7' 9' and between the adjusting-nuts is confined the upper endof an arm 9, which is fixed to one end of the shaft G and extendsbetween the screen-frame and beam a. The upper end of the arm g isapertured or recessed to receive the rod j, and in the vibratorymovement of the screen the arm 9 is carried therewith alternatelyagainst rubber or other buffers k, interposed between the arm and theadj usting-nuts j 7' with the result that the lever is rocked and theheads it are carried alternately forcibly against the bottom of thescreen. The employment of the rubber or other buffers relieves the framefrom jar and vibrations, and by employing buffers of differentthicknesses the force of the blows may be regulated, though, if desired,the nuts may be adjusted to or from each other to secure suchregulation.

In operation the screen is rapidly reciprocated or vibrated through itsconnection with the crank-shaft, and in its movement the heads 1;rapidly produce blows on the screen, the result being high efficiencyand largelyincreased capacity. The means by which the movement of thescreen actuates the impact device greatly simplifies the structure ofthis class of screens, insures durability and nonliability to disorder,and minimizes the power necessary for the operation.

Obviously in screens of large area more than one impact device may beemployed, in which event, however, all of them will be operated throughmovement of the screen.

I claim as my invention- 1. In combination with a vibratory screen andsupporting-frame therefor, a transverse shaft carried by the frame, aplurality of strikers fixed to the shaft, adjustable buffershoulders onthe screen, and an arm fixed t0 the shaft and extending between theshoulders.

2. In combination with a vibratory screen and supporting-frame therefor,a transverse shaft carried by the frame, a plurality of arms fixed tothe shaft and provided with strikingheads, a rod on the screen, adjlisting-nuts and bufiers on the rod, and an arm fixed to the shaft andextending between the buffers.

23. In combination with a vibrating screen and supporting-frametherefor, a crank-shaft having pitman connection with the screen, afly-wheel on the crank-shaft having an adj ustablecounterbalance-weight, a transverse shaft carried by the frame, aplurality of strikers fixed to the shaft, adjustable huifershoulders onthe screen, and an arm fixed to the shaft and extending between theshoulders.

In testimony whereof I afiix my signature in presence of two witnesses.

NATHAN STEDMAN. Vitnesses:

GEORGE E. DOWNEY, FRANK B. SHUTTS.

